Reduce supply chain risk

lib/Crypto/AESEsp32.cpp

@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2018 Southern Storm Software, Pty Ltd.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include "AES.h"
+#include "Crypto.h"
+#include <string.h>
+
+// AES implementation for ESP32 using the hardware crypto module.
+
+#if defined(CRYPTO_AES_ESP32)
+
+// Declare the functions in the esp-idf SDK that we need.
+extern "C" {
+int esp_aes_setkey(unsigned char *ctx, const unsigned char *key,
+                   unsigned int keybits);
+int esp_aes_crypt_ecb(unsigned char *ctx, int mode,
+                      const unsigned char *input,
+                      unsigned char *output);
+};
+
+AESCommon::AESCommon(uint8_t keySize)
+{
+    memset(ctx, 0, sizeof(ctx));
+    ctx[0] = keySize;
+}
+
+AESCommon::~AESCommon()
+{
+    clean(ctx, sizeof(ctx));
+}
+
+size_t AESCommon::blockSize() const
+{
+    return 16;
+}
+
+size_t AESCommon::keySize() const
+{
+    return ctx[0];
+}
+
+bool AESCommon::setKey(const uint8_t *key, size_t len)
+{
+    if (len == ctx[0]) {
+        esp_aes_setkey(ctx, key, len * 8);
+        return true;
+    }
+    return false;
+}
+
+void AESCommon::encryptBlock(uint8_t *output, const uint8_t *input)
+{
+    esp_aes_crypt_ecb(ctx, 1, input, output);
+}
+
+void AESCommon::decryptBlock(uint8_t *output, const uint8_t *input)
+{
+    esp_aes_crypt_ecb(ctx, 0, input, output);
+}
+
+void AESCommon::clear()
+{
+    uint8_t keySize = ctx[0];
+    clean(ctx, sizeof(ctx));
+    ctx[0] = keySize;
+}
+
+AES128::~AES128()
+{
+}
+
+AES192::~AES192()
+{
+}
+
+AES256::~AES256()
+{
+}
+
+#endif // CRYPTO_AES_ESP32